how to add arrows in legend() in R?

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lkconmed.pdf (7.34 KB)

2017-2-25 05:51:09 上传

2 X 2 plots

For the attached plot, I want to put 4 colored arrows as shown in the each plot into the legend which is in the middle of the page instead of just four colored lines in the current legend area . Is there a way to do this legend? Thanks!

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关键词：Legend Arrows arrow egen rows legend

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